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Alesis ADAT-HD24 Digital Recorder  

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Product #246021

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  • Alesis

    Expand your DAW's power with the reliability versatility, and convenience of a standalone hard disk recorder.

    In the studio or on the road, the Alesis ADAT-HD24 Digital Recorder gets the job done. This 24-track, 24-bit/96kHz hard disk recorder was originally designed to fit comfortably into any standard ADAT environment and match ADAT's legendary performance and affordability. Today, more an more pros are using the HD24 for high-quality audio capture, while freeing up computer resources for more processor-intensive plug-ins, virtual instruments, and mixing.

    The onboard 40GB hard drive can be easily extended with low-cost IDE computer drives that are as affordable as traditional ADAT tape on a per-track basis. 2 hot-swappable media bays provide convenient access to the recording drives and allow quick backup from one hard drive to another. The only HD recorder that includes ADAT optical format and ADAT Sync to work efficiently with existing ADAT systems. 44.1kHz and 48kHz internal sample rates, slaved to external word clock, with 96kHz and 88.2kHz option. 12 tracks at 88.2 or 96kHz through the digital ins. 24 tracks at 44.1 or 48kHz through the digital or analog ins. 103dB A/D/A converters. Internal editing including cut, copy, paste, and track-move with undo. Multiple units can be synchronized to create a larger system. 24 analog ins and outs, ADAT Optical in/out, word clock in. All necessary hardware and connectors included.


    • 24-track, 24-bit digital audio recording
    • 44.1kHz internal sample rates
    • 12 tracks at 88.2 or 96kHz through the digital ins
    • 24 tracks at 44.1 or 48kHz through the digital or analog ins
    • 103dB A/D/A converters
    • Slaves to external word clock
    • 40GB built-in HD
    • Dual recording bays accept standard IDE drives
    • Internal editing capabilities
    • Can run with multiple units
    • 24 analog ins and outs
    • All necessary hardware included

    Expand the capabilities of your system with high-quality audio capture, or simply enjoy the reliability of standalone hard disk recording.


    ADAT-HD24 Digital Recorder Specifications:

    • 2 caddys: 1 with installed 40GB HD; 1 empty which can contain IDE/EIDE/ATA Drive of 5400/7200/ 10000 RPM up to 2000GB
    • 24 tracks at 24-bit/48kHz, 12 tracks at 24-bit/96kHz
    • Digital sample rates: 44.1—96kHz
    • Analog sample rates: 44.1—48kHz (HD24). Upgrade HD24 to 96kHz with the EC-2.
    • Analog connections: 24 - 24-bit inputs, 24 - 24-bit outputs (1/4" TRS, +4dBu)
    • Digital connections: 24-channel I/O via 3 ADAT Optical inputs and 3 ADAT Optical outputs
    • MIDI in/out
    • Alesis Sync in/out (DB-9)
    • Word Clock input (BNC, 75?)
    • Footswitch jack for punch in/out (1/4")
    • LRC input for traditional wired remote (1/4")
    • 10 Base-T Ethernet (RJ-45).
    • Frequency response: 20Hz—20kHz +0/—1dB. Dynamic range: 103dB A/D, >103dB D/A (A-weighted)
    • Distortion: <0.003% THD+N
    • Input levels: nominal +4dBu, maximum +19dBu Pitch control: +100 cents/—200 cents, min-max 30—50kHz (30—100kHz with version 2.0)
    • Power: 90—230V AC, 60W
    • Dimensions: 19"W x 5"H x 17"D (483mm x 127mm x 432mm), 3U rackmount
    • 20lbs.
    Customer Reviews

    Review Snapshot®

    by PowerReviews

    (based on 19 reviews)

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    Reviewed by 19 customers

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    An Alesis gem

    By Dan, of

    from Kittery Point, Maine

    I've had my HD24 for 77 years now. When I bought it I thought I was getting something I could use until I "upgraded". Forget that. I've never bothered. I worked and recorded in some very high end studios, and this does it all. I record on my Adat, and I edit and master on the computer. This, some nice pre's and mics, and you can do projects you can be proud of. People come to me now to record, and either we edit, they edit, or they ship it off to a production site. Thanks Alesis, you've kept me alive.

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    One of the best units out there

    By seekerofrock

    from Florida

    My studio was using a multi-track reel-to-reel machine for awhile (still use 1/4" reel for final mixdown). I decided to incorporate one of these into my system while still maintaining the board and outboard processing setup used with the reel-to-reel machine. This is a quality machine. What really stands out and makes this stand out are the converters. This should be priced way higher than it is for the converters alone. Tape tracking adds a natural compression that gives a deep, big sound to recorded music when run at high speeds. This unit adds that big sound. The sound coming back to the board is much more robust and rich than the signals being sent through the board. In this setup, it is a great solution to record the tracks. It also has a lot of onboard options if you mix "in the box", but I do not. I use IDE hard drives like tape reels, and easily switch them out from the front drive bays for each separate album. Pop in a new standard IDE hard drive and you're ready for a new client/session.

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    (1 of 1 customers found this review helpful)



    By bpb

    from FLA

    I bought this for full band recording. I've done several project from Large movie soundstages to small clubs, it worked flawlessly with my Panasonic DA7 digital board. The included TRS and lightpipe inputs make it a deal at the price. Do yourself a favor and get the Fireport for file transfer...all other options are SLOW.

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    super toy...

    By Lonzenator

    from Pensacola, fl

    I purchased this unit to use in a project studio. I have owned other recorders such a Fostex FD-8 (an incredible unit in its own respects). The hd-24 has been a trouble free, easy to use machine and gets great recordings every time. The converters (even at 44/16) sound incredible. Again, What you put in, is what you get out. The unit offers plenty of headroom and I have yet to over run a track converter level wise. This unit has been used to pull a full 24 track live recording and gave perfect results. I have been able to cut numerous demos w/out a hitch.I am currently doing a full CD project for my church and the results thus far, have been stellar.The main suggestion is to forget using the network option and purchase the fireport for transfer to your daw for editing and subsequent mixdown. This unit does require a substantial investment to get the most out of it (i.e. mixer, good headphones and monitors) and it is not a playtoy, but it will give an awesome recording if you know what you are doing.Buy this and then plan on investing in good mics and pres. This will equal any other unit on the market. Remember, Alesis set the standard in adat recording and held the market for years. This unit has been around for a long time and I don't see it going anywhere soon.I must stress, this is not an entry level unit. It is made to cut real track for real projects, not just playing in the bedroom, but it can do that as well.Email me for any questions. I will answer.

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    Best Hard Disk bang for buck

    By guitar bill

    from Thundering Woods, AK

    I have had one of these for a couple of years and I really like it. Alesis writes some of the best manuals out in recording land and they make it pretty easy to do even the advanced functions. Make sure you test your drives on all tracks though because some of the legacy drives are not fast enough to keep up with more than 8 or so tracks and you will get the dreaded buffer underun message upon playback although all might seem well when recording. For critical sessions fully test your drives with full program recording and playback on all tracks and you will be happier with the outcome. For people who need 24 tracks and remote recording possibilties this box is your path to easy recording. Use these with a UPS so the unit doesn't crash mid session. If you don't you'll be kicking yourself when you lose that great take.

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    Going to buy an additional one

    By fmradio man

    from Winchester, VA

    The answer to my on-location multitrack recordings. As others have stated, so easy to use. 40 hours of 24 tracks is awsome. Just set it and forget it. I wish I could transfer faster via the ethernet though. Copy buffer could be a little bigger. Just don't use Maxtor hard drives. My second unit is on the way.

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    A lot of bang for the buck but ...

    By Record Master

    from San Diego, CA

    We rented one of these units this weekend for a mobile production and I have to say it was beyond easy to use. I never had to unwrap the manual. It worked just like you would logically think it would. A dream! My __only__ complaint is that I don't believe in using optical (lightpipe) to get my audio off the unit because of timing and jitter problems so I use ethernet. I have a gigabit network at the studio and this unit only has a ten megabit connection. It took almost 30 hours to get four hours worth of recording off. With gigabit that would have been an hour. Other than that, it's an awesome machine and I probably will buy one if they ever upgrade to gigabit.

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    Excellent Recorder

    By Will-Jny8s

    from Fairborn, OH

    I been doing recording for a while now. This machine is by far the best gear I've owned. You have industry standard at your fingertips. Tranferring music from your computer to the HD24 is a snap with easy setup through ethernet.

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    Totally awesome

    By Jimmy K. Productions

    from Buffalo, NY

    If there was a video instructional, it would be the best. For right now, experiment, & enjoy.

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    Throw away your Studer, Tascam, Otari Etc.

    By Charlie Castro

    from Parlin, NJ

    I never thought I'd see the day when I could make amazing 24 track masters for under 2K. Having owned a 3M-M79, Studer A-800 and various other high tech analog machines, I still find it hard to belive that this 3 rack space gem could out perform all of them, and then some. The sonic detail on this machine is great. The operation of it is extremely easy and the results are breathtaking. I was an analog beliver until I heard this unit. There is no comparison between this HD-24 and your top of the line Analog recorders. I have done the A-B test, and even recorded simultaneously to both, and I ended up using the Alesis HD-24 for its sonic detail, clarity and ease of operation. I strongly recommend this machine to anyone looking to produce high quality 24 track masters.

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